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Note Debt Securities Held-to-maturity (Aggregate Amortized Cost and Fair Value of HTMS by Contractual Maturity) (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Held-to-maturity Securities, Classified [Abstract] |  |
Amortized cost - Within 1 year | $ 3,510 |
Amortized cost - After 1 to 5 years | 17,005 |
Amortized cost - After 5 to 10 years | 23,940 |
Amortized cost - After 10 years | 57,120 |
Amortized cost | 101,575 | $ 107,019
Fair Value - within 1 year | 3,474 |
Fair Value - After 1 to 5 years | 15,924 |
Fair Value - After 5 to 10 years | 22,239 |
Fair Value - After 10 years | 61,016 |
Total investment securities held-to-maturity - Fair Value | $ 102,653 | $ 97,501

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